Cutting millet stem at harvest until the end of November reduced by 76 to 92.5% the number of third generation larvae of Coniesta ignefusalis entering diapause. When harvest was done after the beginning of December, reduction of diapausing larvae in millet stems did not exceed 50%. Weekly harvests from beginning of November to the end of January 1988–1989 and 1989–1990 showed an increased percentage of larvae in diapause. The percentages of larvae in diapause reached 100% at the end of January in 1988–1989 and between the end of December and beginning of January in 1989–1990. The distribution of diapausing larvae in the stems was not regular with 60% of the larvae located between 40 and 80% of the total stem height.
